Resources Contact Us Home
Biodegradable bursting release system

Image Number 4 for United States Patent #5429822.

A biodegradable polymeric multiphasic release system of one or more biodegradable bursting units capable of delivering biologically active substances in a burst or pulse at predetermined times and a method for constructing those units is disclosed. The individual bursting units of the system may take the form of a biodegradable, membrane coated capsule surrounding a core material which may include an active agent. The membrane ruptures after a predetermined time upon exposure to water or bodily, or other aqueous environmental fluids. The bursting units may be used in any situation in which a controlled pulsed release of an active substance is desired. The predetermined time release of each bursting unit is controlled by the composition of the core material, the initial radius and wall thickness of the membrane and the porosity of the membrane. The core material may also contain a chemical composition which generates gas as fluid is drawn into the bursting unit thus adding an additional design variable for predetermining bursts.

  Recently Added Patents
Controller for soldering iron
Dental plier
Device and method for quantizing and inverse quantizing LPC filters in a super-frame
System for and method of remotely auditing inventoried assets
White light emitting diode (LED) lighting device
Output queued switch with a parallel shared memory, and method of operating same
Apparatus and method of preventing signal delay in display device
  Randomly Featured Patents
Surface-mounted lighting system
Set of male members for snap buttons on tape
Use of a second stage reactor in the manufacture and recovery of methyl tertiary butyl ether
Magnetic resistor control assembly
Solid rotor assembly
Moisture absorbent mask covering the face, neck and ears
Analog-to-digital converter with level converter and level recognition unit and correction memory
Hierarchical storage systems for holding evidentiary objects and methods of creating and operating upon hierarchical storage systems
Cart braking device
Light emitting display